mob/var/list
    Quests=list(\
        "onquest1"=0,
        "onquest2"=0,
        "onquest3"=0,
        "onquest4"=0,
        "onquest5"=0,
        "onquest6"=0,
        "onquest7"=0
        )
    //#You could use the value to check for things.
    //---------------------------------------------
    //0 = You're not on the quest & it's available.
    //1 = You've started the quest and have yet to finish it.
    //2 = You've completed the quest.
    //3 = You can't do this quest right now.

mob/proc
    Save()
        var/savefile/F=new("Saves/[src.ckey].sav")
        F["Quests"]<<src.Quests
    Load()
        if(fexists("Saves/[src.ckey].sav"))
            var/savefile/F=new("Saves/[src.ckey].sav")
            F["Quests"]>>src.Quests

mob
    Login()
        src.Load()
        src.Quests["onquest2"]=3
        //The above disables quest two.
    Logout()
        src.Save()
        del src

/**/
//Or you could do something like this
/**/

mob/var/list/Quests=list()

mob/Login()
    src.Quests.Add(new/Quest/Quest_1)

Quest
    var
        name
        mission
        obj/need
        ammount
    Quest_1
        name="Ambush!"
        mission="Kill 5 bandits."
        need=/obj/stolen_goods
        ammount=5
//